Bone density is a measurement of the mineral density in your bones. It is used to determine a person's risk for osteoporosis.
Humans and possibly a few other primates are the only animals that get a rash from poison ivy. Your dog and cat donât get it, nor do birds, deer, squirrels, snakes and insects. However, be sure to wash your dog after a walk near poison ivy because the urushiol can be carried on dogsâ fur and transferred to you!
Although delayed hypersensitivity is responsible for the reaction to poison ivy, here, for comparison, is a brief introduction to the other two mechansims of hypersensitivity. 1  Immediate hypersensitivity occurs within minutes of exposure to the foreign substance, also called the antigen.